The Chaplain Corps of the United States Air Force (USAF) is composed of both clergy—commissioned officers who have been endorsed and ordained by a religious organization—and enlisted Religious Affairs. As military chaplains, their main purpose is to support the free exercise of religion by members of the military service, their dependents, and other authorized personnel. They also provide advice on spiritual, ethical, moral, and religious-accommodation issues to the leadership of the United States Department of Defense.